Black screen when path tracing is enable

Hi, I cannot share my projects since they are confidential due to my company. Is there any othe option to get some support??

It seems like path tracing goes black when there is a large amount of polygons on the scene. For example, I have 5 models inside the scene, if I hide one or two, whatever they are, it works fine. But when all of them are enabled, path tracing goes black.

Regards